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[Structural organization of human yolk sac epithelium during first three months of intrauterine development]

N N Dubinina, V D Novikov, Iu I Sklianov

    Morfologiia (Saint Petersburg, Russia)
    |April 26, 2005
    PubMed

    Insights

    Human yolk sac epithelium undergoes significant morphological changes during prenatal weeks 5-12. Its secretory activity peaks at weeks 7-8, followed by a decline indicating the loss of organ function by the embryonic period.

    Area of Science:

    • Developmental biology
    • Human embryology
    • Histology

    Context:

    • The human yolk sac is a transient organ crucial for early embryonic development.
    • Studying its epithelial development provides insights into embryonic organogenesis.

    Purpose:

    • To investigate the morphological and functional changes of the human yolk sac epithelium during prenatal weeks 5-12.
    • To correlate these changes with the organ's functional status.

    Summary:

    • The study examined the endodermal epithelium of the human yolk sac from prenatal weeks 5-12.
    • Initially, the epithelium showed high volume density and polymorphism, with peak secretory activity at weeks 7-8.
    • Subsequently, total volume density decreased, inner lining increased, cavities vanished, and cell/nuclear volumes reduced, indicating functional loss by the embryonic period's end.

    Impact:

    • Reveals the dynamic changes in human yolk sac epithelium during critical developmental stages.
    • Suggests the yolk sac's primary functions diminish significantly by the end of the embryonic period.
    • Provides a histological basis for understanding early human development and potential developmental abnormalities.

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